It's all about rotational mechanics. When you turn your hands over you're rotating them around their centre point, which is near the middle of your palm.
这是一个力学常识，当你翻转手掌时，手掌是以掌心为中心旋转地。
2
Is the purpose of this book to expose this world of quantum mechanics that people find so mysterious and point out that it's everywhere?
这本书的目的在于展示被多数人认为很神秘的量子力学世界并同时指出它的无所不在么？
3
So, I will point out, in terms of mo theory, because it rigorously does take into account quantum mechanics, it starts to become complicated once we go beyond diatomic molecules.